improve ui module

autojs/src/main/assets/modules/__ui__.js

@@ -1,13 +1,20 @@
 module.exports = function(__runtime__, scope){
     var ui = Object(__runtime__.ui);
+
+
     ui.layout = function(xml){
         view = ui.inflate(activity, xml);
         ui.setView(view);
     }
 
     ui.setView = function(view){
+        ui.view = view;
         activity.setContentView(view);
     }
 
+    ui.id = function(id){
+        return ui.view.getChildAt(0).id(id);
+    }
+
     return ui;
 }